Azo dye



[UNI-TED STTES PATENT OFFICE.

THOMAS H. LEAMING, F BUFFALO, NEW YORK, ASSIGNOR TO NATIONAL ANTLINE 6a CHEMICAL 00., IN'C'., OF NEW YORK, N. "521, A CORPORATION OF NEW YORK.

AZO DYE.

No Drawing.

To all whom it may concern;

Be it known that I, THoivrAs H. LEAMING, a citizen of the United States, residing at Buffalo, in the county of-Erie, State of New York, have invented certain new and useful Improvements in Azo Dyes; and l'do hereby declare the following to be a full, clear, and exact'description of the invention, such as-will enable others skilled in the art to which' it appertains' tomake and use the same. The present invention relates to a new disazo dye which is of value for dyeing silk, cotton, wool. and other fibers, and as a union dye for fabrics composedof various miX-' is now diazotized in the usual manner with 3.4% kg; of sodium nitrite.. 12.0 kg. of 1.8- -aminonaphthol-d-sulfonic acid S-acid) are dissolved in 10 liters of 10% aqueous caustic soda, the solution diluted to 200 liters, aciditied with acetic acid and cooled in an ice p-phenylenediamin is now added arnl the mixture stirred until coupling is complete. The precipitated monazo, dye is then filteredoff and saponified (to split off the acetyl group and replace the same by hydrogen) by boiling it in 800 liters. of 10% caustic soda solution. At the end of this time (about 5 hours), hydrochloric acid isadded until the reaction 1s slightly acid, the solution cooled and the precipitated product. filtered off. This product is then dissolved in 1,000 liters of water containing 30 kg. of sodium carbonate and to the cold solution there is added a diazotized solution of 7.5

"kg. of acet-p-phenylenediamin (prepared as- Specification of Letters Patent. Patentgd 11 m, 22, 1921,

Application filed February 2'7, 1920. Serial No. 361,?29.

one molecular proportion of 1.8-aminonaphtholr l-sulfonic acid (S-acid) saponifying off the acetyl group, and coupling the intermediate monazo compound so obtained with another molecular proportion of diazotized acet p-phenylene diamin. The new dyestufl in the form of its sodium salt has the following probable formula:

.NH.CO.CHa

above), and the mixture stirred until the coupling is complete. llt v is then salted; out

wit common salt, preferably at 80 (3., cooled and filtered. llf desired the dye may be purified by dissolving in water and reprecipitating.

The new disa'zo dye produced as described above, in the form of its sodium salt and in its dry and powdered state, is a reddish black powder, soluble in water with a greenblue color, soluble in alcohol with a blue color, and soluble in concentrated sulfuric bath. The cold solution of diazotized acetacid with a blue-green color which solution upon dilution with ice-cold water turns to a green-blue color and finally, upon standing,v

' veloped upon the fiber or fabric with betanaphthol, or metaphenylenediamin, or

meta-tolylenediamin or resorcin, or. the'like to give in general bluish to greenish shades of black which differ from the self-shade in tint and in superior fastness.

The dyed materials produced either by the action of the 'dyestufi' itself, or by developing the new dyestuff on thefiber or fabric,

as well as the new dyestuff itself, form a part of the present invention;

' Hm -l l=N i OaNa said dye, in the form of its sodium salt, beinga reddish black powder soluble in water with a green-blue color, soluble in alcohol a can be developed on the fiber.

2. Th able by claim agent.

e herein described new dye obtain- 1 and deyeloping with a developing diazotizing the new disazo dye of I claim:

1. The herein described new disazo dye having in theshape of its sodium salt the following probable formula:

' NH OH 3. The herein described new dye obtainable by diazotizing the new disazo dye of claim 1 and developing with m-tolylenediamin.

4. Materials dyed with the new disazo dye of claim 1.

5. Union fabrics dyed with the new disazo dye of claim 1. I

6. Materials dyed with the new disazo dye of claim 1, said dye being developed on the material.

7. Union goods dyed with the new disazo dye of'claim 1, said dye being developed on the fabric.

In testimony whereof I afiix my signature.

THOMAS H. LEAMING. 

